Preventing SQL Injection
To prevent SQL injection, always use prepared statements with parameterized queries, as demonstrated in the safe code example:
Java
public List<BankAccount> FindAccountsByCustomerId(String Id) throws SQLException { String sql = "SELECT customerid, acc_number, balance FROM Accounts WHERE customerid = ?"; Connection c = dataSource.getConnection(); PreparedStatement p = c.prepareStatement(sql); p.setString(1, Id); ResultSet rs = p.executeQuery(); // ... } |
In this secure version, we use a prepared statement with a `?` as a placeholder for the `Id` value. The `setString` method safely binds the parameter to the query, ensuring that any malicious input is treated as data, not code.
Understanding and Preventing SQL Injection in Java Applications
In the world of web applications and databases, security is paramount. SQL injection is a common and dangerous vulnerability that can compromise your application’s integrity. In this article, we will delve into the fundamentals of SQL injection, understand how it works, and learn how to protect your Java applications from this menacing threat.